Jupyterlab-code-formatter

**Server extension**

No changes.

**Jupyterlab extension**

- Add detect notebook type fallback;
- Make failure to determin default formatters more prominent;

**Server extension**

No changes.

**Jupyterlab extension**

- Fix error reporting when blank code cell(s) exists;

**Server extension**

- Add version API handler;

**Jupyterlab extension**

- Fully prohibit mismatched lab and server extension usage (accounting for either stale lab or server extension);
- Use Jupyterlab dialogs for error reporting instead of console for clarity;
- Support multiple default formatters to be ran in sequence;

**Server extension**

No Changes

**Jupyterlab extension**

- Address Jupyter lab 2.0.0 breaing changes;

**Server extension**

- Defer trailing newline removal to labextension;
- Prohibit mismatched lab and server extension usage;

**Jupyterlab extension**

- Make tool bar format all button respect where it's clicked;
- Delete trailing newline for notebook cells only;
- Prohibit mismatched lab and server extension usage;

**Server extension**

- Handle :code:`indent_by` and :code:`start_comments_with_one_space` for styler;
- Unify magic and semicolon handling for Python formatters;

**Jupyterlab extension**

- Handle :code:`indent_by` and :code:`start_comments_with_one_space` for styler;

**General**

- Various fixes to docs;
- Various fixes to Makefile;